Riveting machine



Feb. 9, 1932. E. w. STEVENS RIVETING MACHINE Filed Jan. 17, 1928 INVENTOR. Edward /I/ Sfeuen:

ATTORNEY.

Patented Feb. 9, 1932 'TATES PATENT oF icr;

H TOOL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY RIVETING MACHINE Application filed January 17, 1928. Serial No. 247,313.

The present invention relates, generally, to compress on riveting machines and,,more particularlyto rlveting machmes of the pneumatic type which are light and compact and suited for manual use and at the same time are adapted to apply considerable force for the compression of rivets and for use generally. i n

An object of the invention is to provide a hand tool for compressing rivets to head them over.

Another object of the invention is topro- .vide a hand riveter of the pneumatic type in which means are incorporated for greatly 5 multiplying pressure supplied from a source illustrativeembodiment of the invention, and

of power to pressure applying parts.

Other objects and advantagesof the invention will appear from the following description and accompanying drawings showing an the invention also consists in the devices and combinations and arrangements of parts set forth in the accompanying claims;

In the drawings: 7

Fig.1 is a longitudinal midsection view in elevation of an embodiment of the invention;

Fig. 2 is a bottom plan view of the device of Fig. 1' with the conduit-handle thereof omitted; and i Fig. 3 is an end elevation looking in the direct-ion of the arrows 33 of Fig. 1 and with certain parts omitted.

Referring to the drawings, the cylinder 1 has a closed end 2 and at the opposite end 5 an extension 4 (Fig. 2) beyond the stroke of the piston 6 carried in said cylinder. Bosses 7, 7 (Figs. 2 and 3), one on either side of said extension 4 near its outer end, carry a rod or bolt 8 which extends across said explate 16 inplace. Said piston 7 is hollow and carries therein the bosses 18, 18 each of which has a counterbore 20, one aligned opposite each of said studslO, 10. A pair of compression springs, 22, 22, each one having one 4 end resting against the bottom of one of said bores 20, 20 and the other end about a corresponding one of said studs 10 and resting against the head 12 thereof, serve to move said piston 6 to the closed end of the cylinder and hold it there when operating pressure is not applied thereagainst. Said studs 10, 10 through contact with the bottoms of said bores 20,20 serve to limit the movement of said piston 6 toward the open end of the piston. These studs 10, 10 also, as can be seen, serves to hold said cover plate 16 in place and, also, to guide said springs 22, 22.

At one side, at ninety degrees to said bosses axis of said cylinder 1a pair of spaced apart ribs 24, 24 between which is formedin the side wall of said extension 4 a longitudinal .slot. Said ribs 24, 24 carry clamped between them by the bolts 26 and 27 an arm 28(omitted from Fig. 3) which extends outwardly beyond said extension 4 and this arm 28 carries at a short distance from its outer end spaced apart raised lugs 30,30 between which EDWARD STEVENS, OF DETROIT, MICHIGAN, ASSIG-NOR TO CHICAGO PNEUMATIC -7, 7 said extension 4.carries parallel to the a the stud 31 holds pivoted the lever 32 (also omitted from Fig. 3). Beyond said lugs 30, 30 the end of said arm 28 serves as an anvil jaw 33 and has adjustable therein the screw 34 whose inner end is'concave to fit the end of a rivet. Alock nut 35 serves to secure said screw at an adjusted or set position. Said lever 32 at its outer end has a compression jaw 36 which, in the embodiment shown, carries a pointed tool 38 especially adapted to engage and expand hollow rivets. Thedis- 'tance between said tool '38 and said anvil screw 34 is adjusted to suit the length of rivets to be expanded by means of a screw driver inserted in the slot 40 shown in the lower end of saidlscrew34, thejnut 35 being loosened before and tightened after the adjustment.

Said lever the side of said cylinder extension-4 opposite said arm 28 and has pivoted to'its forked end 41 thetoggle arm '42 which extends through 32 extends from said stud 31 to a slot 44 formed through the wall of said cylinder extension 4 and between said studs 10, 10 and springs 22, 22. At its inner end said toggle arm 42 is pivoted to a cooperating toggle arm 46 which extends through the slot adjacent ribs 24 and at its outer end, is pivoted to said bolt 27, a slot'48 being formed in said arm 28 at this place to accommodate the end of said toggle arm 46 and permit its movement therein. The inner ends of said toggle arms 42 and 46, where they are pivoted together, are offset as shown in dotted lines in Fig. 3 to permit the alignment of said toggle arms 42 and 46 with each other. A hearing rod 50 extends across bosses 18, 18 of saidpiston 6 and carries pivoted thereto one end of the connecting rod 52 whose slotted outer end straddles the inner ends of said toggle arms 42 and 46 and is pivoted therewith in common by the stud 54.

Cylinder end 2 has formed thereon near its edge opposite said arm28 a backwardly projecting boss through which is formed a bore 62, tapped at its outer end and connecting with the bore of. said cylinder 1 at its inner end. A; throttle handle 62. is connected with said boss 60 by a nipple 64. The bore 66 of said throttle handle 62 is divided transversely of its length into two parts 66 and 66 by a partition 68 which has a part 70 extending parallel to the sides of said handle 62. Said partition part 70 has a port 72 connectingthe two parts of said bore 66., 66', stem 74, extending throughsaid port 72 and through a closely fitting bore 75 formed in the upper wall of said bore 66', carries a closure member 7 6 below said port 72. A compression spring80, seated at its upper end against the lower side ofsaid closure member 76 and at its lower end against the bottom of a counter. bore 82 formed in a plug 84 threaded through an opening in the handle below said port 72, tends to hold said closure member 76 in closed position. A. compression spring'86 fitting. close to said stem 74 and bearing at its lower end against the upper surface of said closure member 76 and at its upper end against a sealing Washer 77, serves to prevent leakage and to keep said stem 7 6 aligned and prevent it from binding in said bore 75. Centrally in said stem 74 is an axial bore 88 with which connect the cross bores 90. 90 which connect with the open air above the outside wall of handle 62 when said spring holds said closure 76 across said port 72 and said stem 74 is in the raised position. Another set of cross ports 92, 92 in the central position of said stem 74. connect said bore 66' with said axial bore 88 and through said cross bores 90, 90 to the open air. A handle lever 94 pivoted to the ribs 96, 96 on the upper side of throttle handle 62: over said bore 66 extends backw'ardly over the-upper end of said stem'74 and serves by the depression thereof to open said closure 76 to admit pressure fluid from a suitable source (not shown) to said piston 6. In the use of the device throttle handle 62 and arm 28 serve as handlesflche latter being rounded.

oif as shown to suit this purpose. Their otfset arrangement relative to each other facilitate the convenient and accurate manipulation of the tool.

When pressure is admitted against said piston 6 the latter is forced forward until stopped by saidstuds 10, 10 said toggle arms 42, 46 being extended and said lever 32 being raised to the positions indicated in broken outlines in Fig. 1 whereby said compression jaw 36 is brought down against said anvil jaw 33. Upon release of said handle lever 94 said spring 80 raises closure 76 and stem 74 to close port 72 and open bore 66 to the open air whereupon said springs 22, 22 move piston 6 to the closed end of cylinder 1 and restore toggle arms 42, 46 and lever 32 to the full line positions shown in Fig. 1, thereby opening said jaws 33 and 36.

It is to be understood that various omissions, substitutions, changes and modifications of the devices and arrangements and combinations of parts shown and described may be made without departing from the scope of the invention as set forth in the claims.

I claim:

1. In a pneumatic riveter, in combination a cylinder having a closed end, and an open end, a piston in said cylinder, a straight arm extending from said cylinder, a lever pivoted to said arm, the outer ends of said arm and lever being adapted to cooperate as rivet compression elements, a pair of cooperating toggle arms, one pivoted to the inner end of said arm and the other pivoted to the inner end of said lever, a link pivoted at one end tothe center of said piston and at the other end to said toggle arms, an abutment in the form of a bolt extending transversely of said piston at a point adjacent said open end, aplurality of coil springs interposed between said piston and said abutment yieldingly to hold said piston at the closed end of said cylinder, guide rods for said springs having perforated portions through which said abutment bolt extends, and a cover plate for the open end of said cylinder secured to said rods.

2. A fluid pressure riveter comprising a cylinder having a closed end, a piston reciprocable within said cylinder, an abutment member extending transversely of said cylinder remote from said closed end, lever arms extending on opposite sides of said' member, said arms being pivoted together and providing cooperating jaws, one of said arms being secured to said cylinder, a toggle connection within said cylinder between said piston and said arms for engagement with said member, said cylinder having slots in the wall thereof for portions of said toggle connection to be secured to said arms and for movement of said portions, and resilient means interposed between said member and said piston yieldingly to maintain the latter adjacent the closed end of said cylinder and said jaws open.

Signed by me at Detroit, in the county of Wayne, and State of Michigan this 14 day of January, 1928.

EDWARD W. STEVEN S.' 

